How can I set my mac (and the screen) to not go on sleep mode ?

I just want my mac (and the screen) stay alive for a minimum of 8 to 10 hours, not going in sleep mode (or save screen).  Just displaying a web page without doing anything else. In preference system, energy save is all set to «never», but after a while the screen goes to sleep ... ?

You probably have a corrupt .plist file. To fix:
1. Hold down the option key.
2. In the Go menu in the Finder, scroll down to Library
3. In Library, find Preferences
4. In Preferences, find com.apple.systempreferences.plist  and drag it to the trash
5. restart
6. you will have to reenter your preferences. 
Another option is caffeine: Lighthead - Caffeine

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